Previous Year Question

The correct answer is (d) Summer season.

When the land surface becomes hot, the air in contact with it also warms and expands. This reduces the density of air and causes it to rise. As a result, a low-pressure condition develops near the surface.

In India, excessive heating during summer, particularly over northern and north-western parts, causes atmospheric pressure to fall. This thermal low also plays an important role in the subsequent development of the monsoon circulation.

In contrast, during winter, colder and denser air generally produces a relatively high-pressure condition.